Method of making rotary cutters



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(No Mdel.)

o. H. TRASK. l METHOD 0F MAKING ROTARY GUTTERS.'

Patented 001;. 25, 1887.

45 provided with a central hole, a.

f UNITED STATES PATENT OFFICE CHARLES H. TRASK, OF LYNN, MASSACHUSETTS, ASSIGNOB TO THE DUPLEX SHOE TRIMMER COMPANY, OF PORTLAND, MAINE.

. METHOD OIF MAKING ROTARY CUTTERS.

:SPECIFICATION forming part of Letters Patent No. 372,050, dated @cracher 25, 1887.

Application tiled February 8., 1887. Serial No. 226,97. (No model.)

To all whom, it may concern.-

Be it known that I, CHARLES H. TRasK, of Lynn, in the county ot Essex and State of Massachusetts, a citizen of the United States,

.have invented a new and useful Improvement in the Method of Making Rotary Sole-Edge Cutters, of which the following is afull, clear, and exact description, reference being had to the accompanying drawings, forming a part of ro this specification, in explaining its nature.

The invention relates to a method of forming sole-edge cutters in groups of two or more, whereby the cost of manufacture is materially lessened, because less labor and time are required in making them.

Heretofore it has been customary to make such cutters singly-oronc ata time. The present meth od involves the making of two or more simultaneously from a block of metal of 2O suitable size, and then separating' the block into independent or separate trimmers.

In the drawings I have represented the process as applied to the manufacture of two trimmers; but it is obvious that three or more can be formed in the same manner.

Referring to the drawings, Figure l is a view in elevation of a metal block of a length sufficient to form two trimmers with hubs.`

Fig. 2 represents the said block reduced by the o simultaneous operation thereon ofpropershaping-tools into two partiallyformed right trimmers. Fig. 3 is an end elevationof the block after it has been submitted to a further operation, whereby teeth are formed in both trim- 5 mers. Fig. /lis an elevation representing the teeth of the trimmers as backed off. Fig.

5 is a view in side elevation showing the block separated into two separate or distinct trimmers. Fig. tirepresentsthe block as sepa- 4o rated or divided into two parts before t-he cutters are formed, instead of after.

In practicing the invention the block a, of metal of suitable length, is reduced to substantially the shape represented in Fig. l, and is This block is then mounted upon an arbor, and is submitted to the action of a suitable turning-tool, whereby there is simultaneously formed thereon the partially-formed cutter A, the

the cutter A, and the hub b of the cutter B. The block as thus shaped is then submitted to another machine, whereby the crossrecesses c are formed through both sections A B, the block being moved in relation to the cuttingtool or the cutting-tool in relation to the block to form the recesses across both sections A B of the block as a continuous operation. This forms the teeth D-.upon both sections A B, and the teeth are then backed oft by a suitable tool 6o to form the cutting-edges e, (see Fig. 4,) and the block is then divided into two right cutters, or left, as may be wished, (see Fig. 5,) each of which has a hub, d, and which are in every respect counterparts. Of course the same result can be effected by mounting upon an arbor separate blocks of a size to produce a single trimmer, instead of a block of a length to produce two or more, and submitting the blocks to the action of tools which simultane- 7o ously form the sections A Band hubs a b.

lf desired, the trimmer may be made without hubs a b, and when so formed there will be no hub section between the two sections The edge or periphery of the counterpartsections A B may have any other desired configuration than that shown, and for sole-edge trimming this edge configuration is changed very considerably to suit the varying thiok- 8o nesses of soles, as well as the pitch of the edge.

Having thus fully described my invention,

I claim and desire to secure by Letters Patent fof the United StatesrThe process of forming counterpart sole-,85

edge trimmers, the simultaneous forming in partially-formed cutter B, and the hub a of 5o' 

